Method and apparatus for wiring coil-springs



F. M. STEVENS. METHODAND APPARATUS FOR WIRING COIL SPRINGS.

I APPLICATION FILED NOV. 13, I911. 1,351,448.

' Patented Aug. 31, 1920.

ATTORNEY UNITED STATES PATENT QF Fl C E,

FREDERICK STEVENS OF NEW YORK, G R To JOHN HATI IiLON & sons, 2 A CORPORATION on NEW YORK; j

METHOD AND APPARATUS FOR WIRING "COIL-SPRINGS. Q

ToaZZ whom it may concern: p

Bei t known that I, FREDERICK M. STEVENS, a citizen of the United. States, and residing at New'York city, county of New York, and State of. New York, have invented certain new and" usefullmprovements in -Methods and Apparatus for Wiring Coil-Springs, of,

which the following is a specification. This invention relates to method and apparatus for wiring coil springs before,

tempering. Coil-springs are used in large.

quantities for tire pressure gages, scales,

etc., and it is necessary that such springs be.

to keep the springs of uniform shape and t under uniform pressure. If one or more of the coils slip, the spring does not uniformly temperand may have to be rejected.

' i The present invention comprises a method and apparatus for uniformly wiring such springs while holding the spring itself against distortion, and has the result of etfecting a considerable saving in the cost of such work and also insuring greaterunijformity of product.

In the accompanying drawings, Figure 1 is an elevation of one Fig. '1', a

Fig. 3 is a sectional view of the mandrel hollow cylindrical body portion 2 having a central core 3, the core being spaced from l the hollow body 2 so as to form an annular coil and receiving the coil.

space ,of substantially the size of the spring The function of this is to hold the coils against displacement or distortion, since the coils in springs. of this characterare easily displaced. The body 2 and the core 3 are provided with parallel slots 4, 5 to receive a looped wire 6, the function of the slots beingto prevent 1 the wire from being turned when the projecting ends 7 are twisted together as shown Application filed Noveniber:13,-1 91?. Serial Ito. 201,768

formof apparatus for carrying out the lnventlon, 51:. Fig. 2 is an end view'of a portion of' Specification of Letters Patent; Bi ten-fed A g; 31

. in Fig, 5. The procedure isto place one or more previously prepared looped or doubled wires 6- in the mandrel slots, theninsert' the coil spring 8,-andfinally twist the ends 7 together/ The end of the core 3 :is provid'ed :withaslot or index 9 for the purpose of; positioning the endqof' the coil 10in. fixed relation to the wires 6, so as to insure absolute uniformity of the springs. If. thlsis not done, there is a tendency for the springs;v to vary owing-Ute the difference caused by applying the wires at different points, and also because one Wire should beapplierlat or'ne'ar the. end of the coil. The wires are twisted-by means of a IO- tating head l2 having'a slot 18. for receiv;

ing the wire'ends 7 and twisting pin 14.

The headl2is mounted on a shaft 15 which isljournaled in a frame 16 andoperated by a crank 17 .1 The-mandreliis supported on arestvl8 having guide pins '19 andan end stop 20 engagingthe end ofthe i mandrel.

The shaft-l5 is mountedto reciprocate from the extreme left'position 'ass hown'in :Fi'g;

lltoward the right su'fliciently for the head 12'. to clear the ends of; the wires, and toy enable this to be readily accomplished, the' shaft is provided. with a wing 21 which is loosely v engagedflinaslot inlthez'crank ar 17.2 The jcrank arm isjheld in position on: j i i the shaft by meansof pins220n oppositesides thereof, whilethe' crankiarm is exten'ded and providedizwith axhook 23 which; en- Y gages" a. fixed dish 7 2st mounted on "the By thisconstructioin the shaft) 15 can be" reciprocated back and forth inthe' frame 16 by a corresponding movement of the handle '25, while wheneverthe handle 25 and the crank arm 17 are rotated, the shaft 15 is turned through the wing 21. The loop is turned.

23 and the disk 24 cooperate to actas a fulp: crum when the shaft is reciprocated, and i also prevent disengagement when the shaft in'the mandrel, the operator simply has to place themandrel on the support 18against I the stop '20 and then engagethe twisting.

headl2 with the projecting .wires 7 by manipulation of the crank arm 17'through handle 25. Having effected the engagement the handle is 'then rotated to twist the,

wires.

"Whatis claimed is 1. The method which consists in tying the coils of a formed spring in. contact with each other while 'hold'i'n'gthe spring, coils and tie against displacement with respect to each other andconfining-thespring innormal shape by a mandrel.

2. The method which consists in twisting. a longitudinal wire tie at a predetermined position on the COllSjROf? a formed" spring while holding the spring against lateral displacementiby amandrel confining the spring 7 adapted .to receive and hold wire loop on opposite sides of the, coil against turning.

- a ainst. turning.

in normlal shape. I r

3. .Th'e0m-ethod whi'chconsists in placing a plurality oi loops of wire and a formed coil' spring on a' mandrel and then fasteningthe. ends of the. wire to hold the spring under uniform compression in its predeftermined form.

4. The 'method which consists in 'positioning a"loop:.='of wireon a' mandreL positioningcoil spring on the' mandrel i so as to be held :in shape by the mandrel *andern braced by: the loop, and then fastening the ends of'the loop to' hold the spring to 1 its predetermined i form;

5. The method which consists in placiirg a: plurality of loops of wire; and a formed coilispringroirzacylindrical mandrel so as tOxllOlCl the: spring in-shape and the 'loops in predetermined relation, and" then twisting the ends of; the loops toscompress the' coils' ofther'springzin .contact with each other.

A? mandrel: for wiring a formed: coil spring comprising a: portion formed to fit the springgand' adapted to receive and 'hold awire loop on' oppositesidesof the'coil 7..A'mandrel for wiring-aformed coil spring; COHllll-ISIIIg; a: portion formed to closely litthe spring and having means 8. A mandrel for wiring a. formedcoil spring; comprising a portion formed to fit the spring and. adapted to receive and hold a wire loop on oppositesides of the coil against turning and an index for determinfor receiving and holding a Wire loop on opposite sides of the spring coils.

10; A mandrel for wiring a formed spring: comprising a? hollow cylinder having an interior core providing an annular space to receive a1coil}spring, said cy-linder. and core having cooperating: longitudinal slots tov'receivefa loopedi'fastening wire. a

ll. Atma-n drelifor wiringzahformed coil spring;comprising a hollow cylindrical portion "formed to :lit the :spring I and having a lOIlgltHClHlEklSlOt 1113 its ,lIlllellOl surface adapted-to receivev'a' fastening wireh 12. 111 an. apparatus for/wiring. a coil spring, as support, a cylindrical mandrel s carrying in predetermined relation. a formed coilspring-anda fixed fastening wire loop having projecting end s a rotary head having'means for en'gagingflthe wire ends; and

means for" rotating the. head to twist the wire'on'thespring; 1

- l3; Apparatus-for twisting-J a formed :coil i springi holding wires comprising a mandrel support,. a hollow cylindrical mandrel adapted to carry within itself a formedycoil r spring and a" fixed wire "loop"; disposed on each' side of; the coil with endscprojectin'gbeyond the mandrel,- a :reciprocatory, and ro-2 tatable'twisting: headhaving its; axis :looated in-line-withrthe coil, and means forwreciprm cating the :head toaengage and disengagetheloop ends and-forf'rotatmg the head to twist:

the loop ends while the loopfand coil spring are held in fixed relation by the", mandreL.

In testimony whereof; Ii have signed my name to thisspec1fica-t1on;-. 111 the; presence of two. subscribing;witnesses, this 3'lst'dayof October,gl9l7. p r j .FREDERICKEM. STEVENS";

'lVitnesses: V 1 1 LiL -IAN 1A-.;.MUnN-znR,- ,TrroMAs LE DY, J r. i 

